Apparatus and method for determining the clearance and wear of mechanical back-up bearings of turbomachinery utilizing electromagnetic bearings. In order to reduce the prospects of catastrophic failure during a shut-down or loss of electrical power, a rotating apparatus utilizes the electromagnetic bearings to manipulate the shaft to measure the clearance of the mechanical back-up bearings. When power is restored, a programmable controller provides power to the electromagnetic bearings to automatically move the shaft in accordance with a predetermined sequence to contact the mechanical back-up bearings to determine the clearance of the mechanical back-up bearings. These values are stored in the controller memory. The measured clearance is compared to prior clearance measurements of the mechanical back-up bearings to determine the wear of the back-up bearings. The actual wear is compared to the allowable wear for the bearings. If actual wear exceeds a predetermined value, a warning is generated. If the actual wear equals or exceeds the allowable wear, the controller automatically locks the turbomachinery from further operation until repair or replacement is accomplished. Otherwise, the controller centers the shaft to permit normal operation of the turbomachinery.

Apparatus and method for determining clearance of mechanical back-up bearings of turbomachinery utilizing electromagnetic bearings

The invention relates to a simulation test method of a rotating outer ring/fixed inner ring rolling bearing The bearing test device is composed of a drive motor (1), a coupling (2), a rear pivot bearing (3), an outer ring shaft (4), a front pivot bearing (5), a sliding guide rail (6), a loading hydro-cylinder (8), a hinge I (9), an inner ring shaft (10), a hinge II (11), a spring (12) and a loading sleeve (13), wherein the outer ring of a test bearing (7) is installed in a cantilever end outer sleeve of the outer ring shaft; the inner ring of the test bearing is installed on the inner ring shaft; the inner ring shaft is fixed on the loading sleeve; the loading hydro-cylinder directly loads the test bearing in the radial direction by using the loading sleeve; and the axial holddown spring, the sliding guide rail, the hinge II and the like are utilized to realize axial positioning of the test bearing and reduce the interference of the radial force, thereby completely simulating the simulation test method of the rotating outer ring/fixed inner ring rolling bearing The invention can be used for carrying out property simulation tests on the test bearing according to the velocity spectrum and loading spectrum

Simulation test method of rotating outer ring/fixing inner ring of rolling bearing

The invention relates to a method for the measuring axial clearance and the preloading chearance of face-to-face angular contact ball bearings, which comprises the following steps of: first, manufacturing an inner ring spacer bush (4), a gasket (1), an outer diameter loading block (7) and a measuring system; putting the outer ring (3) of a bearing I on the gasket (1); putting the bearing I and a bearing II face to face into the inner ring spacer bush (4), and putting the outer diameter loading block (7) into the outer ring (5) of the bearing II; and calibrating a measuring instrument, and making either end of two equal length levers, which is provided with a right angle measuring head, extend into the measuring instrument through the two gap grooves of the inner ring spacer bush (4). During measurement, the counterweighted outer diameter loading block (7) applies axial loading to the bearing I and the bearing II, two right angle measuring heads respectively align to the central pointsA and B of the bearing I and the bearing II, wherein A-B=delta. If delta is a negative value, the bearing I and the bearing II are shown to be preloading chearance. If delta is a positive valve, the bearing I and the bearing II are shown to be axial clearance. The invention has the characteristic of simple operation. The measuring result does not need complicated conversion. The A valve and the Bvalve can be intuitively read. Besides, conversion and cumulative errors do not exist.

Method for measuring axial clearance and preloading chearance of face-to-face angular contact ball bearing

The invention discloses a dynamic performance testing device for a cylindrical roller bearing retainer. The dynamic performance testing device for the cylindrical roller bearing retainer comprises a testing main body, an electric main shaft, a frequency converter, a hydraulic loading system, a computer monitoring system and a data acquisition system, wherein the electric main shaft and the hydraulic loading system are respectively connected with the testing main body; the frequency converter is connected with the electric main shaft; the electric main shaft provides the testing main body with the power; the hydraulic loading system provides the testing main body with a testing load; after the hydraulic loading system loads, a signal measured by a measuring device on the testing main body and testing parameters of both the electric main shaft and the frequency converter are respectively input to the data acquisition system; a signal output end of the data acquisition system is input to the computer monitoring system; and a control signal of the computer monitoring system is input to the frequency converter, so that the rotating speed of the electric main shaft is controlled through the frequency converter. The dynamic performance testing device for the cylindrical roller bearing retainer, disclosed by the invention, has the advantages of adoption of electric eddy current displacement sensor, good reliability, wide measuring range, high sensitivity, high resolution, fast response speed, strong anti-interference performance and no influence from mediums such as greasy dirt. As the testing main body of the dynamic performance testing device for the cylindrical roller bearing retainer adopts a closed box structure, impurities can be prevented from entering into the box efficiently.

Dynamic performance testing device for cylindrical roller bearing retainer

The invention relates to a radial internal clearance measurer for a bearing. The measurer is characterized by comprising a stand and a control system, wherein a belt conveyer, a turnover mechanism, a detection mechanism and a classification conduit are sequentially arranged on the stand; a first handling mechanism is arranged between the belt conveyer and the turnover mechanism, and a second handling mechanism is arranged among the turnover mechanism, the detection mechanism and the classification conduit; the first handling mechanism is used for handling the measured bearing to the turnover mechanism from the belt conveyer, and the measured bearing is turned over for 90 degrees on the turnover mechanism; and the second handling mechanism is used for handling the measured bearing to the detection mechanism from the turnover mechanism and handling the measured bearing on the detection mechanism to the classification conduit from the detection mechanism. The radial internal clearance measurer can be used for automatically detecting the radial internal clearance of a bearing and replacing the manual measurement of operators, thereby lightening the labor intensity of workers, improving the detection efficiency, improving the detection accuracy and reducing the production cost of bearings.

Radial internal clearance measurer for bearing

The invention relates to a multifunctional automatic measuring instrument of a large-scale precise bearing axial play, which comprises an electric system (1), a precise pressure gauge (2), an upper pressing sleeve (3), a precise pressure regulating valve (5), a sensor regulating stand (6), a lateral inductance transducer (7), a gauging mandrel (8), a lower pressing sleeve (9), a gauging main spindle and a charger (10), a bearer (11), a fork-lever coupling (12), a Hall component (13), a synchronous motor (14), and a gauging base (15). The invention solves the difficult problem that a large-scale precise bearing axial play is hard for highly precise measurement, a reliable detecting and analyzing data is provided for assembling and employing a bearing, and a measured bearing (4) is multifunctionally and automatically measured, a need of quick test for a bearing user is satisfied, simultaneously, a measuring standard of an axial play is provided for a precise bearing of a non-separable large-scale finished product which is larger than 100mm.

Large-scale precision bearing axial clearance multifunctional automatic measuring instrument

A multifunctional automatic measurement method for radial clearance of large-scaled precision bearing adopts static measurement, dynamic measurement and three-point measurement and is capable of automatically loading and automatically measuring. The three measurement manners can be implemented on one measuring apparatus at the same time. The measuring apparatus mainly comprises an electrical system (1), a measurement pedestal (2), a sensor support (3), a sensor adjusting nut (4), an inductive sensor (5), an upper cylinder support (6), an upper loading cylinder (7), a measurement shaft centre (9), a measurement main shaft (10), a lower loading cylinder (11), a lower cylinder support (12), a measurement support (13), a synchronous motor (14), a Hall element (15), a belt wheel and cog belt (16), a precise pressure regulating valve (17), and a precise pressure gauge (18). The measuring apparatus can provide reliable detection and analysis data for high-precise measurement of radial clearance of large-scaled precision bearings (8).

Large-sized precision bearing radial play multifunctional automatic measurement method and measuring apparatus

A detector used for detecting rotation or separation of an outer ring of a spherical plain bearing in an assorted casing is characterized in that an axial loading cylinder (7) is fixed at the upper end of a gantry fixing frame (9), the upper end of the axial loading cylinder is connected with a torque sensor (8), the torque sensor is connected with a rotary loading cylinder (10), the rotary loading cylinder is fixed via a support arranged at the upper end of the gantry fixing frame, a loading sleeve (6) is arranged at a loading head at the lower end of the axial loading cylinder, the width of a groove of the loading sleeve is identical to that of the outer ring of the spherical plain bearing (4) to be detected, the spherical plain bearing (4) to be detected is mounted in a casing (3) which is arranged at the upper end of a fixed frame (2), the gantry fixing frame and the fixed frame are both arranged on a base (1), an induction sensor (5) is embedded on one side of one end of the fixed frame, and a probe of the induction sensor contacts with the outer ring of the spherical plain bearing to be detected. The detector can accurately detect indexes of rotation of the outer ring of the spherical plain bearing relative to the casing and axial displacement and separation thereof after the bearing is applied with certain load.

Luoping Deng

Papers

Large-scale precision bearing axial clearance multifunctional automatic measuring instrument

Large-sized precision bearing radial play multifunctional automatic measurement method and measuring apparatus

Detector used for detecting rotation or separation of outer ring of spherical plain bearing in assorted casing